Would be heavy, to create enough force to oppose the wieght/power of the rider. Unless you use electro-magnets, but then you need batteries, would need to charge them up, and would be equally, if not heavier.....

....halfway through a ride and the bearings start grinding... "shite, need to charge the bike up"

Problem with magnets is 'drag/friction' (Eddy Currents) when one goes over the other, if this is less or more than some nice bearing I don't know. Of course you could use this problem to your advantage, possibly of dynamo style and run your Di2

I don't know about the weight problem though as two of the modern strong magnets when you try to ram them together, even when small, can be extremely hard to ram them together.

Though you still have the problem of seals, it's the seals in a biking system that take create the more friction. Rip them out, use some light grease in a pedal or wheel and they run for ages.

in spin tests, new external BB's don't spin hardly as much as some older systems, if you include wheels as well...all that drag adds up. (perhaps i sholdn't have mentioned engines as they are under compression)

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